硫酸酸性硫酸銅水溶液の水素加圧還元時におけるBiの反応促進効果に関する研究

抄録

The reduction rate of cupric sulfate solution with hydrogen was catalytically enhanced by addition of 0.5g/l Bi³⁺. The catalytic effect of Bi³⁺was remarkable at high sulfuric acid concentration.
Without Bi³⁺ addition, the reduction curves seem to be consisted of two segment, an initial stage with faster reduction rate and a later stage with very slow rate.
After nucleation of copper, Cu₂S is begun to form on copper surface, and when copper particles are covered with Cu₂S, the reduction rate becomes very slow, and a long reaction time is required to complete the reduction.
By addition of Bi³⁺, formation of Cu₂S is supressed and also the reduction rate after nucleation is accelerated by addition of Bi³⁺.